Device for indicating condition of gas in refrigerating apparatus.



T. E. MURRAY & A. W. H. GRIEPE. DEVICE FOR INDICATING CONDITION QF GAS IN BEFRIGERATING APPARATUS.

APPLICATION FILED NOV. 8, 1912.

1 13,985, Patented July 21, 19M

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To all whom it may concern:

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ASSIGNOR TO SLAB) MURRAY;

DEVICE IQR INDICATIITG CONDITION OF GAS IN REFRIGERATING APPARATUS.

Specification of Letters Patent. Patented July 21, 1914.

Application filed November 8, 1912. Serial No. 780,198.

Be it known that we, THOMAS E. MURRAY and Answer W. H. Guinrn, citizens or the v United States, residing at New York,-in the county of New .York and State of New York, have invented a certain new and useful Improvement in Devices for Indicating Gondition of Gas in Refrigerating llppar-a' tus, of which the following is a specification.

ln ice-making ancl refrigerating apparatus operating 'on the compression cycle principle, wherein gas is condensed to a liquid which is afterward expanded in the cooling coils, it frequently happens thatthe gas becomes weakened or adultcratcd by atmospheric air containing moisture, and henc .ess efficacious in operation.

Our present device is a trap wherein the moisture contained in the gas is not only collected and prevented from returning to the systcm,-but said moisture acts upon a body of absorbent materialdispcsed. in said trap to change the color thereof. This change is at once visible through the transparent wall of the trap, and serves to indicate the condition of the to the attend ant. v

in the accompanying drawingsl igure 1 is an elevation, and Fig. 2 is vertical scction of our device. Fig." 3 is cross section on the line m, m of 2.

Similar letters of reference indicate like parts.

A is a metal cup, having a threaded tubular external projection B to entcr'the gas conduit (not sho\vn and an internal tubuar projection (i. In, the Wall of cup A is a sight-opening l). l Vithin said cup is a sec tion E of glass tubing, forming a lining and closing the opening D. Also within said cup and filling the space between glasslining 1. and internal projection C is an annular body F of paper or other suitable absorbent material. threaded cover G.

The body F is dyed with a material which undergoes a marked change of color Above the body F isle when subjected to the action of the gas employed when said gas is of a predetermined working strength, but which undergoes less change when acted upon-by said gaswhen in adulterated or weakened condition. Thus, for example, in a system in which the refrigerating volatilizable liquid is sulfur dioxid, the body F may be dyed with a litmus solution. Such a solution, when subj'ected to the strong gas due to volatilization of sulfur dioXid, becomes blue; but it'thc gas becomes weakened or adulterated by atmospheric air containing moisture, the color will be purple and more incline to red as the weakening or adulteration of said gas increases. i

The need of admission of a fresh supply of strong gas free from mo1sture is thus 1ndicatcd. The moisture in the tested gas becomes trapped at the bottom of the cup A,

and is thus prevented from returning to the system.

We claim:

A cylindrical receptacle constructed to wall, a cylindrical lining of transparent material forming a closure for said opening, means for conveying a gas charged with moisture into said receptacle, and a body of material adapted to change color when subj ccted to the action of moisture disposed in said receptacle.

in testimony whereof we have affixed our signatures 1n p'rcsencc of two Witnesses. THOMAS E. MURRAY. AUGUST W. H.'GRIEPE. -Witnesses:

' v Gnu'rRUnn T. PORTER, MAY T. MCGARRY. 

